request_uri

# File actionpack/lib/action_controller/request.rb, line 343
    def request_uri
      if uri = @env['REQUEST_URI']
        # Remove domain, which webrick puts into the request_uri.
        (%r{^\w+\://[^/]+(/.*|$)$} =~ uri) ? $1 : uri
      else
        # Construct IIS missing REQUEST_URI from SCRIPT_NAME and PATH_INFO.
        uri = @env['PATH_INFO'].to_s

        if script_filename = @env['SCRIPT_NAME'].to_s.match(%r{[^/]+$})
          uri = uri.sub(/#{script_filename}\//, '')
        end

        env_qs = @env['QUERY_STRING'].to_s
        uri += "?#{env_qs}" unless env_qs.empty?

        if uri.blank?
          @env.delete('REQUEST_URI')
        else
          @env['REQUEST_URI'] = uri
        end
      end
    end